When you ownership of real estate, you need to pay acquisition tax (shutoku zei).

In order to calculate the amount of acquisition tax, you can use appraised value of real estate.So, 5 million yen (land) /2 + 1.2 million yen (house) = 3.7 million yen.3.7 million yen × 3% = 111,000 yen.This is acquisition tax.

Then, you need to pay registration tax.When you obtain ownership right of real estate, I will file registration of ownership transfer for you.

As for Gift tax
As mentioned above, when the amount of gift is 1.1 million yen per a year, you do not need to pay gift tax.
So, you can take this kind of process.
In 2018, you have decided to receive ownership transfer of real estate only for 1/3rd.
1.2 million yen (house) + 2 million yen (land) =3.2 million yen.
3.2 million yen / 3 =1,066,000 yen.
This is less than 1.1 million yen. So, you do not need to pay gift tax.

In 2019, you have decided to receive ownership transfer of real estate only for 1/3rd.1.2 million yen (house) + 2 million yen (land) =3.2 million yen.3.2 million yen / 3 =1,066,000 yen.This is less than 1.1 million yen. So, you do not need to pay gift tax.

In 2020, you have decided to receive ownership transfer of real estate only for 1/3rd.1.2 million yen (house) + 2 million yen (land) =3.2 million yen.3.2 million yen / 3 =1,066,000 yen.This is less than 1.1 million yen. So, you do not need to pay gift tax.

In this way, you can own whole real estate and can avoid payment of gift tax.